AOAC-ModernStandby(1).ppt

ModernStandby SDHF AndyMu Terminology 2 TermDescriptionCSConnectedStandby Windows8 8 1 MSModernStandbyDRIPSDeepRuntimeIdlePlatformStatePEPPowerEnginePlug indriverSoCSystemonachipRTD3RuntimeD3 Introduction 3 Windows8ConnectedStandby CS EnablesthesmartphonepowermodelonthePCProvidesaninstanton instantoff 立即开关机 UEastheirphonesS0lowpoweridlemodelenablesthesystemtostayup to datewheneverasuitablenetworkisavailableExpectinstantlyavailablepowermodelinsteadofthetraditionalS3 S4powermodelWindows10ModernStandby MS ExpandstheWindows8 1CSpowermodeltobemoreinclusiveandallowssystembasedonrotationalmediaandhybridmedia SSD HDDorSSHD ExpandsaNICthatdoesn tsupportallofthepriorrequirementsforCStostilltakeadvantageofthelowpoweridle MShavetheflexibilitytoconfigurethedefaultbehaviortolimitnetworkactivityOnlywakesfromthelowestpowerstatewhenabsolutelynecessary realtimeactionrequired OSmaintenanceorauserwakesthesystem Thelowpoweridlestateisaccomplishedthroughtightintegrationbetweenthefirmware chipset lowpowercomponents devicesanddrivers DRIPS DeepestRuntimeIdlePlatformState correspondstothelowestpowerstatefortheSOCduringCSorMS Powermodes 4 TwopowermodelsinWindows10 S3andModernStandbyModernStandbycanbeconnectedordisconnectedinstandby Thisbehaviorisdictatedbythehardwareand orbyconfiguration Behaviordifferences 5 ConnectedanddisconnectedMS WhethermaintainingnetworkconnectionS3andMS LowestpowerstateverysimilartoS3 processorsarepoweredoff memoryinself refresh Maindifferenceisthepathofhowsystementersandexitslowpowerstate S3systemiseitheractiveorinS3 forMS thetransitionhaveserialsofstepsandcomponentsarepowereddownwhentheyarenotinuse CSandMSWakepatternswhileinDRIPS CS wakeupatleastonceevery30secondsfromDRIPStoprocessworkMS postponingnon criticalworkandremovingunnecessarywakeups particularlyonbatterypower SometimersarepostponeduntilsystemiswakeorpluggedintoAC AdvantagesofusingMS 6 InstantonResumetimefromthelowpoweridlemodelisatleasttwiceasfastasfromS3resumeBackgroundactivitywhilethesystemis Off SystemisstillinS0 afullyrunningstate readyandabletodowork DesktopappsarestoppedbytheDAM DesktopActivityModerator BackgroundtasksfromWindowsStoreappsarepermittedtodoworkOnaconnectedmodernstandby networkisstillactiveanduserscanreceiveeventsOnadisconnectedmodernstandby VoIPcallswouldn tbeavailable real timeeventscanstillhappenSimplifiedwakestoryAsystemstaysintheS0stateandwakingsimplyrequiresahardwareinterrupt Thus itmayeliminateanyneedforfirmwareinteraction Devicewake evenintheS3model requiresfunctionalityintegratedintotheBIOS Thismakeswaketimesslowerandmorecumbersometodevelop ComparisonSummary 7 Benefits 8 Modernstandbyuserexperiences 9 Power PerformanceTargets 10 SystemPowerState 11 Link IfsystemsupportMS butnetworkingorstoragecan tmeetMSrequirements systemwillautomaticallybeplacedinadisconnectedstate Technicalrequirements 12 FADTflag ACPI S0 LOW POWER IDLEPowerenginePlug In PEP MustsupportHibernate DesignDecisions 13 ThreeareaspertinenttodesigningModernStandbydevices PartselectionOptimizationPowerconfigurationoptions Partselection 14 RecommendedlowpowersupportUSB2 0 LPMsupportforL2 U2PCIe WLANandstorage supportforL1 substateForSATASSDdevicesuseofSlumberandDeviceSleepD3devicepowerstatesupportNICselectionConnectedMSrequiresatleastonenetworkdevicestobeNDIS6 3compliant orthesystemisplacedindisconnectedMSStorageselectionIfthestoragedevice solutionreportsaseekpenalty rotationaldelay indicatingrotatingmedia thendisconnectedwillbethedefaultstandbymode Ifthestoragedevice solutionindicatesthatithasnorotationaldelayorseekpenalty forexample isanSSD thenconnectedwillbethedefaultstandbymode Donotrecommendenablingconnectivityonrotational only HDD systems BatteryselectionBatterylifetargetsvarybyformfactorandprice getthetable StorageOptimization 15 Newadaptiveidletimeoutalgorithmbeintroducedinwindows10 Hostattempttoaveragenomorethanonepowerstatetransitionper5 minuteintervalbydefaultAminiportdrivercanopt intothisbehavior RegisteraSTOR POFX DEVICE V3withStorPortInitializePoFxPowerintheScsiUnitPoFxPowerInfounitcontrolcallback SettheSTOR POFX DEVICE FLAG ADAPTIVE D3 IDLE TIMEOUTflagintheFlagsmemberoftheSTOR POFX DEVICE V3structure SettheMinimumPowerCyclePeriodInMSmemberintheSTOR POFX DEVICE V3structuretothevaluethatindicates intheworstcase howoftenthedevicecanbepowercycled Unitsareinmilliseconds Werecommendthisbeatleast5minutes i e thedeviceshouldnotbepowercycledmorethanonceevery5minutes Link Powerconfigurationoptions 16 Hibernate Bydefault thebehaviorthatdozetohibernateisoffCanbesetthroughtheadvancedcontrolpanelConsidertwofactorswhichmaybeimpactUE storagesizeisextremelysmallanddozetimerS3ObjectpresenceinACPIfirmware S3andMSweremutuallyexclusiveonthesamehardwareForenterprisetosupportWindows7withoutBIOSchanges expectedsystemcouldbeconfiguredtohavebothanS3objectandapopulatedFADTtable ACPIS0LowPowerIdleflag Toolsavailable 17 S3vsMS Apprunning 18 DevicepowermanagementforMS 19 Preparesoftwareformodernstandby 20 Introduction Onentrytomodernstandby appsandsystemsoftwaremustbemadereadyforthetransitiontolow poweroperationPoweringdownthedisplayisthefirstactivitywhenenteringstandbyThedisplayisturnedoffinresponsetotheuserpressingthepowerbutton closingthelid orselectingSleepfromthepowerbuttonintheSettingscharm Afterthedisplayispoweredoff Windowstransitionsthroughasetofphasestoprepareappsandsystemsoftwareforachievinglowpower Thephasesaresequential eachphaseisasetofactivitiesthatmustbeperformedbeforethephasecanbecompletedandthenextphaseentered Preparesoftwareformodernstandby 21 Preparesoftwareformodernstandby 22 Preparesoftwareformodernstandby 23 Preparehardwareformodernstandby 24 Introduction Onentrytostandby hardwarecomponentsmustbepreparedtomakethetransitiontolow poweroperationAftersoftwarecomponentsandappshavebeenpreparedforlow poweroperation hardwarecomponents includingtheirsoftwaredevicedrivers mustbesimilarlypreparedforlow poweroperation Threesteps First alldevicesoutsideoftheSoCorcoresiliconmustenteralow powermodeNext networkandradiodevicesareplacedinalow powermodeformodernstandbyAfteralldevicesoutsideoftheSoC includingcommunicationsdevices havebeenpowereddown thehostcontrollersontheSoCwillbeturnedoff Device specificpowermanagementformodernstandby 25 Display sleep andhibernateidletimers 26 PlatformIdleFloor DeepestS0i3State 27 Thefollowingisalistoffeatures DeviceStatesthatneedtobeenabledtooptimiz